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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df519ba5d9b280dfa67cc2d82d689c5cbb733a8559bd6bb131993c62747548b6' 
  AND token = '5Ec6eVIKe5Lgy5q6hRX6ZYAiujjHNHfqdWyJgW8khng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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