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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebbbf1bee6d54f34b0c11908d4cfee238e3d523b98563f37d9249c8eb4922b2' 
  AND token = 'azyslATrFr36KoqhTGGTs3vV7miTaIOhxrKa66/fa5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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