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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9d6ec4d42d53c3979208b3d8a007d70785a897764cbbf68276d168c7baec3a' 
  AND token = 'tAvnXxEbThOjIeDyAKr/4688dMihL2YFlHC8dEC32IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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