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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cb0949979d9acd13b4ac730588540c9ab07ce4a9672253705824e11251b0ae' 
  AND token = 'WdCaDrBnSSZH2ji7Ft3qn4atC3ydXrdAxfE5g5LYsSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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