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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d04de3ad54c14f6692f8d51cbe4abd584f38b590935c2cbf4b400caa0d8906' 
  AND token = 'qlRhu/MPXuppt1CashdF7bTp0v82jvHbgzXo3tfsNtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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