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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ed1427abf3840f37e1bf7ded398d67990dd47f7fae9f92147d4e447940b7b0' 
  AND token = 'QgRLNhpbiNuX6V3DaA1QDyA/MN3DyPnpRJ5cXc5aJTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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