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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7963f4d121be86a745977de8711963ab06a234ecacafb2209caee39784267bd5' 
  AND token = 'kI7ksT0HbyVHuXV4pis6CEsF44fcc3bUDB/tHfQjQl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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