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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917f9c693e389c13f2690c5b9e50df422c338ad1e069967c5398683d115fca1d' 
  AND token = 'ip0uqJm75i1fNfukzH9B1XgLS43Bs1Tg7mRoyePNZ1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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