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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88aa57e498592e29c5db25ed0795a3228d1df84953a257df9644b7fc9bf91a44' 
  AND token = 'CAqAGobEdS8Lwfa6gvZR8u+qnX9Zmqu2uwNW3DFEbN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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