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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb251bfe3dd4008ac1a964ee93e5005bec94b2c8d5ada6fdc55f43a068d477c' 
  AND token = 'Fa8NoDS+C+q55A8x5ySySf95NrfqDdhXivdkFo2X9Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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