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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7c6ed609176f0e89c21945e2fb8f60bea4d882f366161cfb3a5b7d3720409e' 
  AND token = 'VMNhZt+D5twN1rcvrjwxUjkVIXSdKZV3t7Gk1jrnEVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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