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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da01fe20d00f49f32f707c44201481037c82f5a1b8cf102f7557827bf46a673e' 
  AND token = 'Om8lSPjSUogS2E1jqgJB5jsITh+h/SRSUpQa5pFTZT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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