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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07473c59768d9bdd943bfa9c1573974f7cbadee47f0b996f743935f19cb03bbb' 
  AND token = 'xxwbOvXlQO9CblcrI3BvZz4iQUgXod/52vH3kLNTMJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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