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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aae3160d675d81d4dedee8d5e60e9a7a9203c80f5371cf4b4be28dd67c78263' 
  AND token = 'xwUG3Wgi4lctSEwJaGnQ2UliMazfztAK2EgG/2gmOjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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