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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3d5422e540e029991ab7c9f834158e794779dc489275b89e6b7d66b5c24cdc' 
  AND token = 'f2foSyKkdghZvOoekyFJdvUNsU1J6ZG/1tLfvG9Tp9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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