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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdd0f73acc8592fc8c4fbefb6a79e62b7a09ba91f4efc366fa867032406a3e1' 
  AND token = 'UF8EZeS3YjXUy1iLTn00C8uj4td6M1NDXuQ65lLt1MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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