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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c8e5b55299af9ee6171c2962b3ea8e777a3ad3ddda119d5a45c3babbc58ef0' 
  AND token = 'vxAWcGi8EJBdpI+6559y0b7uZ5FSkddykdrn0aG7A0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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