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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f21a20ed47c94c270dba669d528a17dfadaa10e80ee94edf3dca8119189325' 
  AND token = 'mGO3Q++Yga8hkadaXprFYOG3Piu4Jk3we2qh8wMB1jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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