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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d91b57dbd778dea9a7355efc22691cade7e0f9565052dbd02040a0a0fae407' 
  AND token = 'QTdgzcery1EWLwyWfczuV9UJuFpxcAAi+P7eyC0QuFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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