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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aeeb7751e4587b5a5d464837d7131cbc527a83b8500686d62ba49c17aa103b7' 
  AND token = 'hesk6ztY2kv3HY9SMuSmnqvUSnLictnynxoReDh32V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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