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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a59230a3aedcc4bd6716f1af093ccd5a07c40c07cea94847cb94b797ab9304d' 
  AND token = 'z6drZxLvjpz91Y6oBBSBs/MJlB2D9+jBDLTDuY57+N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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