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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58eb201f466e35353736c655b1968ef8ff24b04d04b8f6847ad9c02260a6be6c' 
  AND token = '6gwzumJgKosDrlhaLgb19RSzGpjiDubKHpeonSRG4oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}