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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294d9a3cc4d390d0b84d67bc1941848b7f2ab5439b4307988a877cbcf74a54b9' 
  AND token = 'wmSwmOVKce20qkBT6xGCK6FlFjC5U0DKK32N2tJCYHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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