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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb634b998f26bd4e71dac55f4b7f698ff875d40e2f4e1e6f5334336311ba371' 
  AND token = 'Gl5+elYr1YYT2uYC4k/bhDmxSz12xSZSTQOkW9O0YSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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