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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302a0393e6e359b4c2967c51e2bf033ead5ea45443f3f88a579bf41bfe58fa2b' 
  AND token = '11WmjSY4OQ3Lx+P6pth6J58cHJ6fISXcJhApq3tdKms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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