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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ef29463d5f0bd3a450223324aa4daa2a2a65aa4a7bd2613eb4175f248ee566' 
  AND token = 'vvzidZ6oWP/4K4cbr3iEe217hB6sD2kv3nMZ0B0tuu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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