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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ad0b6769ddf70a9e1c9681608141e7647618f7c8fd63c49538d42ff5ebb7cb' 
  AND token = 'OayMJ5fYAtks2n2cl+q9z2wFXXh9P1XSTTh6ymDZJjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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