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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16ea037dc7e4ff7830d2e6037c0171bcf61547fd4704024ded5dc804bc6957e' 
  AND token = '5wj7n9GF7eaOH+YcU22KxhPhAU+wqNi52cVHPGfCJaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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