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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90408f8e3650308f9814cb866ba0455c66a7606214022574d98a209dbc1149d3' 
  AND token = 'WwkFPZH91/wYIUVeTz3H608QS3k/+zkfURscoHi4kZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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