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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a726d3410a9a0082a1586d673b574d35a6410206bcbe6e5d04ed878fdab061' 
  AND token = 's2Qo6ueHE/6I62ek5CTLe0bRaNfFX4MlOStq5xEWe2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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