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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1145ff40f30ff4ddbb2be739d1acc59d73ca7e037afb65c22758ec267c9e43e6' 
  AND token = 'bBGKlbgm6ubNrEu79Ok/CR4cl/zPqkRRLC4JBODe2Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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