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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1ef9e2e80ed5e380622e0422699482ea8c0aff6fbdff91501e65797af6dece' 
  AND token = 'Az+OnmU8wjBFa8VMql+93M8seiZYslZ+lw8RKqOoXa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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