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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4a5a0699da9927636ab193aefd3b217f3cd00592171ec8a314556227550020' 
  AND token = 'i5/3MF+NnjN7U2Gtdu3/T4et42icij7MDLRO0F0npF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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