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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c349806bd05b1ab3d3fc75935d609fd774b227e499c92892a0a45a9c40920d06' 
  AND token = 'EbkkxHUyJQmwuxp114ZbyCKSP+z52Y04zGuFt751uLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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