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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6ad47da88e1bdb2449b9c18f8cdb32e0185c85b4ca8ff4fb64743352b28b90' 
  AND token = '6X5tWlytgTnhhbxLfXSchENb9UwU9G2ar+vrOSfEVD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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