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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5178985a5628a9d9c6f471c74b2fa59f69edcc0dc9b7bfb51ba58c49c97ddab' 
  AND token = 'sHl8k+1ngLLWefWjrIUPA+P/BV4L0ytoqel7URSFSSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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