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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10e7f08540b65f126f25a78988507af20e6883022ed17bd5ed06c465a04b133' 
  AND token = '2Q2wYpLQQaTcukDOce/LTgshakuavGSqROeZwpqP2p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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