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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8056bd012eed616d8152c6326617e3c34f66c37cfd6309f89f12e35627cd02c' 
  AND token = 'tVzFmfQ/hCV4OLHjTXnmtKfw4NE7DHQdwd5Yx9UQfYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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