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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee601e713b88059327713b210df302722dfcfd1d738a95dcddf3adda95df22f' 
  AND token = 'XqbjhQaNIdxk1hOUGl75UzXlmlRv3Naqz2rLwmQ6FGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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