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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9fbd11734f4792aec3d726819fd5f6b8739a8ca482ee906e57cf497ef46f32' 
  AND token = 'XJ9RYoVmO6dnHPiClXCXRFNR1FFwh+U+fkF8+PN8Jz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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