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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d88e267d94c7e0c21b42c68dbb3fdf90b872c0dc4adb8b83e9929f630b6cce' 
  AND token = 'xit+o7d43sPgK+GoQrlhbiugTiz2M6QqkMcBNhN+8J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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