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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaeaf3f800ef09f0087b31d50bf07cb4bdbc5bd8aa8b1c4af5f9bd07703d2d87' 
  AND token = 'RkNEC2H9peIVCznJ0gRQ0nDcMj5k6+cHblYMyBO57iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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